Author: jhb
Date: Wed May 29 20:45:31 2019
New Revision: 348371
URL: https://svnweb.freebsd.org/changeset/base/348371
Log:
MFC 345158: Fix uart emulation bug
THRE is always asserted in LSR reads, so REG_IER writes that raise
IER_ETXRDY must also set thre_int_pending.
Approved by: re (gjb)
Modified:
stable/11/usr.sbin/bhyve/uart_emul.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/usr.sbin/bhyve/uart_emul.c
==============================================================================
--- stable/11/usr.sbin/bhyve/uart_emul.c Wed May 29 20:34:35 2019
(r348370)
+++ stable/11/usr.sbin/bhyve/uart_emul.c Wed May 29 20:45:31 2019
(r348371)
@@ -430,6 +430,9 @@ uart_write(struct uart_softc *sc, int offset, uint8_t
sc->thre_int_pending = true;
break;
case REG_IER:
+ /* Set pending when IER_ETXRDY is raised (edge-triggered). */
+ if ((sc->ier & IER_ETXRDY) == 0 && (value & IER_ETXRDY) != 0)
+ sc->thre_int_pending = true;
/*
* Apply mask so that bits 4-7 are 0
* Also enables bits 0-3 only if they're 1
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